Question What's causing jerky first person movement on Quest 2?

Getting horrible jerky movement on Quest 2. The OVR metrics HUD shows the game is running constantly around 70 - 75fps, head tracking is smooth. Have tried minimal setup like removing all real time lighting from scene, removing all enemies / navmesh agents, still seeing the judder.

When testing via Link from Unity Editor, movement is perfectly smooth and exhibits no issues.

I would appreciate any suggestions of what to try to resolve this.

Settings:
Unity 2021.3.8f1
Built in render pipeline / Vulkan / Multiview / Phase Sync on, Symmetric Projection on, Subsampled Layout on
Oculus XR Plugin 3.0.2
XR Plugin Management 4.2.1
Quest 2 system version 56.0.0.171

 

Looking into OVR metrics with more detail I can see GPU U is mostly above 95, so looks like some issues with being GPU bound.

 

Was able to resolve this by the following:

1) reduce shaders precision to use half instead of floats
2) set fixed timestep to 0.017778 to smooth physics
3) reduce complexity of hierarchy for moving objects (see here: https://blog.unity.com/engine-platf...m-the-spotlight-team-optimizing-the-hierarchy)
4)reduce MSAA to 2x
5)turn off 32 bit display buffer